can i use it on canon 5d mark ii?

Yes, but most of us bought it because we can't afford a 5D Mark II. You'd probably be happier with the $250-$300 active extensions, which allow focus and aperture changes with it attached. (this cheap metal tube does not)

What will happen to the picture quality if the "inner glass" is removed? Also, whats the difference between this one and the other ones on the market??

After much testing with Canon FD 300mm prime and Tamron 500 reflex. 2 inner lenses destroys the sharpness. Removing both you lose infinity on Canon but not reflex lenses. Keep the thick inner lens remove the thin one. Perfect. Except now MFD is a little greater. Not important. Sharpness! Remove both for all common reflex lenses still keep infinity.

Does this mount directly to the body? I have a macro lens that I just bought but it is one the screws on to an adapter. Will this work?

It doesn't fit directly onto the body of the Canon EOS M. YOu will need the mount adapter EF EOS M. I bought this with the 0.43x wide angle macro lens 58mm that screws onto the front of my lens. It dose not fit the wide angle macro lens that I bought with it. The wide angle macro lens fits onto the front of my Canon EFS 55-250mm lens. I bought it so I would have the option since it is cheap enough and it gives different results. But since it is manual and it doesn't communicate with my camera, the EOS M sends out a message that a lens is not attached to the camera. However, if you can get it to work with your camera, you can get real close with your zoom lens.

Will this extension fit on my Canon Rebel t3i?

Miss: Alyssa C. My one and only experience has been with the Canon Rebel T3. However, on 30Jan2014 I bought a wide angle lens for my T3. The lens was for a T3i. It fitted just right. It works great in photography involving flowers.

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Fotodiox M42 to Canon EOS EF/ EF-S Adapter, All-Metal, Hardened Anodized Aluminum, Manual Focus, Gray

Fotodiox M42 to Canon EOS EF/ EF-S Adapter, All-Metal, Hardened Anodized Aluminum, Manual Focus, Gray

Product ID: 271348717

Details

Brand
Fotodiox
Compatible mountings
Canon EF EF-S
Focal length description
0.01
Lens type

🎯Precision-crafted for infinity focus & beyond

🔩All-metal hardened anodized aluminum build

⚙️Manual focus & aperture control for creative mastery

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Description

🔗 Unlock Vintage Lens Magic on Your Canon EOS – Because Your Shots Deserve More

PRECISION INFINITY FOCUS - Engineered with high-tolerance craftsmanship to ensure sharp focus from macro to infinity—never miss a shot.
CREATIVE CONTROL IN YOUR HANDS - Manual focus and aperture control empower you to craft every frame with artistic precision—no auto distractions.
BUILT TO LAST BUILT TO PERFORM - Crafted from premium hardened anodized aluminum, this adapter guarantees durability and a sleek, professional look.
VINTAGE GLASS MEETS MODERN TECH - Seamlessly mount classic M42 lenses like Pentax Takumar & Zeiss on Canon EOS bodies for timeless image quality.
TRUSTED BY PROS BACKED BY WARRANTY - Join thousands of photographers who rely on Fotodiox’s 2-year warranty and industry-leading quality.

The Fotodiox M42 to Canon EOS EF/EF-S Adapter is a precision-engineered, all-metal lens mount adapter that allows photographers to use classic M42 screw-mount lenses on Canon EOS DSLR cameras. Featuring hardened anodized aluminum construction for durability, it supports manual focus and aperture control with infinity focus capability. Compatible with a wide range of Canon EOS models, this adapter offers a reliable, high-quality solution for blending vintage optics with modern digital imaging.

Specifications

ASIN	B001G4QXN2
Aspect Ratio	Unknown
Best Sellers Rank	#31,041 in Electronics ( See Top 100 in Electronics ) #996 in Camera Mounts & Clamps
Brand	Fotodiox
Built-In Media	Fotodiox Lens Mount Adapter
Camera Lens	Fotodiox Mount adapter for Pentax Takumar and Zeiss 35 mm lenses, compatible with Canon EOS cameras (e.g. 7D, 60D, 5D Mark III)
Compatible Camera Models	Canon EOS DSLR cameras with EF or EF-S mounts
Compatible Camera Mount	Canon EF, EF-S
Customer Reviews	4.5 4.5 out of 5 stars (348)
Exposure Control Type	Manual
Focal Length Description	0.01 millimeters
Focus Type	Manual Focus
Global Trade Identification Number	00812759010380
Image stabilization	no image stabilization
Item Type Name	Lens Adapter
Item Weight	20 Grams
Lens	Interchangeable
Lens Coating Description	Super Integrated Coating
Lens Design	Prime
Lens Fixed Focal Length	35 Millimeters
Lens Mount	M42
Manufacturer	Fotodiox Inc.
Manufacturer Part Number	07LAm42eosB
Maximum Focal Length	0.01 Millimeters
Maximum Shutter Speed	1/4000 seconds
Media Type	EnhancedContent
Minimum Focal Length	0.01 Millimeters
Model Name	Fotodiox Lens Mount Adapter
Model Number	M42-EF-V1
Photo Filter Size	42 Millimeters
Shooting Modes	Manual, Aperture Priority
UPC	812759010380 703341545543
Unit Count	1.0 Count
Viewfinder Type	Optical viewfinder
Water Resistance Level	Not Water Resistant
Zoom Ratio	1:1

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